Word: arc
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Dates: during 1920-1929
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University of Toronto astronomers, give results for the bending of a stellar ray just grazing the sun's edge, within one-hundredth of a second of arc of Einstein's prediction that they would be deflected 1.75 seconds...
...from Wales and other distant places to test his theory. The secret is being closely guarded, but the method is said to depend on a new kind of receiving instrument, whereby stations can tell the point of the wave's origin to a fraction of a second of arc...